THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The sample web application deploys demo.SimpleApp servlet and JEST servlet. The essential aspect of the deployment descriptor WEB-INF/web.xml is shown below
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<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Demo Application with JEST Servlet</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>demo</servlet-name>
<servlet-class>demo.SimpleApp</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>demo</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>jest</servlet-name>
<servlet-class>org.apache.openjpa.persistence.jest.JESTServlet</servlet-class>
<init-param>
<param-name>persistence.unit</param-name>
<param-value>jestdemo</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>jest</servlet-name>
<url-pattern>/jest/*</url-pattern>
</servlet-mapping>
</web-app>
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Once the sample web application is deployed, say in Tomcat running on localhost:8080, open the web browser http://localhost:8080/demo and you should see the web page served by 
demo.SimpleApp. This step initializes demo.SimpleApp and hence the persistence unit jestdemo.
Now, if you go to URL http://localhost:8080/demo/jest/, the JEST welcome page will be displayed – which is JavaScript enabled web page that demonstrates currently available JEST facilities such as finding or querying for instances.
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